From the “Nature of Diet” section of the linked document – Stefansson and Anderson’s diet:
If someone is eating Carnivore including all of those parts (which looks like it is getting close to nose-to-tail) and eating animal meat produced from animals that were not raised by modern methods (Stefansson and Anderson did their experiment in the 1920’s) then one might be encouraged by the positive results they had.
But, if someone is just eating cheap (antibiotic filled, growth hormone filled unnaturally (grain) fed) meat – I do not think they can use the Stefansson and Anderson results to justify their way of eating. I think this kind of diet would be much better thought of as a short term elimination diet (which may be very beneficial).